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WO2010032775A1 - Station mobile, station de base radio et procédé de communication mobile - Google Patents

Station mobile, station de base radio et procédé de communication mobile Download PDF

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Publication number
WO2010032775A1
WO2010032775A1 PCT/JP2009/066225 JP2009066225W WO2010032775A1 WO 2010032775 A1 WO2010032775 A1 WO 2010032775A1 JP 2009066225 W JP2009066225 W JP 2009066225W WO 2010032775 A1 WO2010032775 A1 WO 2010032775A1
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WO
WIPO (PCT)
Prior art keywords
state
parameter
mobile station
reception state
radio link
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2009/066225
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English (en)
Japanese (ja)
Inventor
啓之 石井
幹生 岩村
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NTT Docomo Inc
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NTT Docomo Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NTT Docomo Inc filed Critical NTT Docomo Inc
Priority to JP2010529785A priority Critical patent/JP5406841B2/ja
Priority to US13/120,352 priority patent/US8797882B2/en
Priority to EP09814619.4A priority patent/EP2341741A4/fr
Priority to CN200980137007.5A priority patent/CN102160434B/zh
Publication of WO2010032775A1 publication Critical patent/WO2010032775A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a mobile station, a radio base station, and a mobile communication method.
  • a mobile communication system is configured to monitor a synchronization state between a radio base station and a mobile station.
  • a synchronization state between a radio base station and a mobile station.
  • the following two indices are defined in order to determine the downlink synchronization state in the physical layer.
  • DPCCH dedicated Physical Control Channel
  • CRC Cyclic Redundancy Check
  • the determination section for determining the downlink synchronization state in the above physical layer is, for example, 160 ms. Further, as will be described later, the determination as to whether or not the radio link failure (RLF) is in the RRC layer is made based on the determination result of the downlink synchronization state every 10 ms.
  • RLF radio link failure
  • the determination as to whether or not the radio link has failed in the RRC layer based on the downlink synchronization state reported from the physical layer and the movement in the radio link failure state The operation of the station UE is defined.
  • step S102 when the mobile station UE receives N313 consecutive “Out-of-sync”, that is, “synchronization state: NG” reports from the physical layer (S102: YES), the timer T313 is started. (S104). Note that steps S102 and S104 may be performed only when the timer T313 is not activated.
  • step S106 when the mobile station UE receives N315 consecutive “In-sync” reports, ie, “synchronization state: OK”, from the physical layer (S106: YES), the timer T313 is stopped. (S108). Note that steps S106 and S108 may be performed only when the timer T313 is activated.
  • step S110 YES
  • this operation proceeds to step S112. If T313 does not expire (step S110: NO), the operation returns to step S102. Note that step S110 may be performed both when T313 is activated and when T313 is not activated.
  • steps S102 to S110 may be performed constantly while the radio base station eNB and the mobile station UE are in a connected state.
  • the processes of steps S102 to S110 may be performed every 10 ms while the radio base station eNB and the mobile station UE are in a connected state.
  • 10 ms refers to one radio frame.
  • the connection state may be an RRC_Connected state.
  • step S112 the mobile station UE considers that the communication state between the radio base station eNB and the mobile station UE is a radio link failure state.
  • the radio link failure state may be referred to as an RLF (Radio Link Failure) state, and refers to a state in which communication quality between the radio base station eNB and the mobile station UE is significantly deteriorated and communication is impossible. .
  • RLF Radio Link Failure
  • step S114 the mobile station UE clears the configuration (configuration) of communication with the radio base station eNB.
  • step S116 the mobile station UE performs reconnection processing.
  • the reconnection process may be referred to as a “Cell Update process”. Note that the mobile station UE performs the reconnection process described above when there is no ongoing process or when the operation during the radio link failure state is not defined in the ongoing process. May be.
  • the mobile station UE when the mobile station UE has an ongoing process and the operation in the ongoing process is defined in a radio link failure state, the mobile station UE performs the radio in the ongoing process. Performs operations when link failure occurs.
  • the parameters such as T313, T315, and N313 described above are parameters corresponding to hysteresis and the number of protection stages, and are parameters for determining a radio link failure state with high accuracy and at an appropriate timing.
  • discontinuous reception (DRX) control is applied to reduce power consumption in the mobile station UE, that is, for battery saving.
  • intermittent reception control in an LTE (Long Term Evolution) mobile communication system is the data to be communicated when the radio base station eNB and the mobile station UE are connected.
  • PDCCH Physical Downlink Control Channel
  • the mobile station UE only needs to receive a downlink control signal transmitted via the physical downlink control channel PDCCH intermittently, not at all timings, so that it is possible to reduce battery power consumption. It becomes.
  • the mobile station UE performs physical downlink only in a reception interval (5 ms in the example of FIG. 15) set for each DRX cycle (1280 ms in the example of FIG. 15).
  • a downlink control signal transmitted via the link control channel PDCCH is received, and the other transceivers are turned off.
  • the reception interval may be referred to as On-duration.
  • the determination is performed with high accuracy and at an appropriate timing based on the parameters corresponding to the hysteresis and the number of protection stages.
  • intermittent reception control is applied when the radio base station eNB and the mobile station UE are connected. That is, as the state of each mobile station UE, there are two types of states, an intermittent reception state and a non-discontinuous reception state, depending on the presence or absence of data to be communicated.
  • the mobile station UE in the intermittent reception state is generally configured to determine the downlink synchronization state described above only in the reception period in the intermittent reception control. Has been.
  • the downlink synchronization state is notified from the physical layer to the RRC layer at a high frequency, for example, every 10 ms, whereas in the intermittent reception state, the intermittent reception control is performed. This means that the downlink synchronization state is notified only in the reception section in FIG.
  • the present invention has been made in view of the above-described problems, and a mobile station and a radio base station that can appropriately determine a radio link failure state in both an intermittent reception state and a non-intermittent reception state It is another object of the present invention to provide a mobile communication method.
  • a first feature of the present invention is a mobile station that communicates with a radio base station, and is configured to obtain a parameter for intermittent reception status and a parameter for non-intermittent reception status from the radio base station.
  • a synchronization state determination unit configured to determine a downlink synchronization state based on a radio quality of a serving cell in the mobile station, and a radio link failure state based on the determination result If the wireless link failure state determination unit configured to determine whether or not the wireless link failure state determination unit determines that the wireless link failure state is present, the connection with the wireless base station is reconstructed. And when the mobile station is in the intermittent reception state, the radio link failure state determination unit is configured to perform the synchronization.
  • the radio link failure state determination unit is configured to determine the downlink synchronization state determined by the synchronization state determination unit and the parameter acquisition unit.
  • the gist is that it is configured to determine whether or not the radio link is in a failed state based on the non-discontinuous reception state parameter.
  • the radio link failure state determination unit activates a timer when the downlink synchronization state is an asynchronous state for a first predetermined period or longer and the timer expires.
  • the discontinuous reception state parameter and the non-discontinuous reception state parameter include a first parameter that defines the first predetermined period, and the discontinuous reception state parameter. At least one of the second parameters defining the timer may be included.
  • the radio link failure state determination unit determines that the state in which the downlink synchronization state is a synchronization state continues for a second predetermined period or longer in a state where the timer is activated.
  • the timer is configured to stop, and the discontinuous reception state parameter and the non-discontinuous reception state parameter may include a third parameter that defines the second predetermined period.
  • a second feature of the present invention is a radio base station that communicates with a mobile station, and is configured to notify the mobile station of an intermittent reception state parameter and a non-discontinuous reception state parameter.
  • the mobile station in a discontinuous reception state is configured to determine whether or not it is in a radio link failure state based on the discontinuous reception state parameter and a downlink synchronization state.
  • the mobile station that is in a non-discontinuous reception state is configured to determine whether or not it is in a radio link failure state based on the non-discontinuous reception state parameter and a downlink synchronization state. Is the gist.
  • the mobile station when the state where the downlink synchronization state is an asynchronous state continues for a first predetermined period or longer, a timer is started, and when the timer expires, The radio link failure state is determined, and the intermittent reception state parameter and the non-discontinuous reception state parameter include a first parameter that defines the first predetermined period and the timer. At least one of the defining second parameters may be included.
  • the discontinuous reception state parameter and the non-discontinuous reception state parameter may include a third parameter that defines the second predetermined period.
  • a mobile communication method for communicating between a radio base station and a mobile station, wherein the radio base station transmits an intermittent reception state parameter and non-intermittent reception to the mobile station.
  • a step A for notifying a state parameter a step B in which the mobile station determines a downlink synchronization state based on the radio quality of a serving cell in the mobile station, and the mobile station has the downlink synchronization state Determining whether the radio link is in a failed state based on the discontinuous reception state parameter and the non-discontinuous reception state parameter, and the mobile station is in the wireless link failure state.
  • step C determining if the mobile station is in an intermittent reception state in step C, the downlink synchronization state when re-establishing a connection with the radio base station. And determining whether the radio link is in a failed state based on the acquired parameter for the intermittent reception state, and in the step C, when the mobile station is not in the intermittent reception state, the downlink link state is determined.
  • the gist is to determine whether or not the radio link is in a failed state based on the synchronization state and the acquired non-discontinuous reception state parameter.
  • a mobile station As described above, according to the present invention, it is possible to provide a mobile station, a radio base station, and a mobile communication method that can appropriately determine a radio link failure state in both the intermittent reception state and the non-intermittent reception state. can do.
  • FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention.
  • FIG. 2 is a functional block diagram of the mobile station according to the first embodiment of the present invention.
  • FIG. 3 is a diagram for explaining how the synchronization state is determined by the synchronization state determination unit of the mobile station according to the first embodiment of the present invention.
  • FIG. 4 is a diagram for explaining how a radio link failure is determined by the radio link failure state determination unit of the mobile station according to the first embodiment of the present invention.
  • FIG. 5 is a diagram for explaining a state of radio link failure determination by the radio link failure state determination unit of the mobile station according to the first embodiment of the present invention.
  • FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention.
  • FIG. 2 is a functional block diagram of the mobile station according to the first embodiment of the present invention.
  • FIG. 3 is a diagram for explaining how the synchronization state is determined by the synchronization state determination unit of the
  • FIG. 6 is a diagram for explaining a state of radio link failure determination by the radio link failure state determination unit of the mobile station according to the first embodiment of the present invention.
  • FIG. 7 is a diagram illustrating an example of intermittent reception parameters and non-intermittent reception parameters used in the mobile station according to the first embodiment of the present invention.
  • FIG. 8 is a functional block diagram of the radio base station according to the first embodiment of the present invention.
  • FIG. 9 is a flowchart showing the operation of the mobile station according to the first embodiment of the present invention.
  • FIG. 10 is a diagram for explaining how a radio link failure is determined by the radio link failure state determination unit of the mobile station according to the first modification of the present invention.
  • FIG. 10 is a diagram for explaining how a radio link failure is determined by the radio link failure state determination unit of the mobile station according to the first modification of the present invention.
  • FIG. 11 is a diagram for explaining how a radio link failure is determined by the radio link failure state determination unit of the mobile station according to the first modification of the present invention.
  • FIG. 12 is a diagram for explaining a state of radio link failure determination by the radio link failure state determination unit of the mobile station according to the second modification of the present invention.
  • FIG. 13 is a diagram for explaining how a radio link failure is determined by the radio link failure state determination unit of the mobile station according to the second modification of the present invention.
  • FIG. 14 is a flowchart showing the operation of a general mobile station.
  • FIG. 15 is a diagram for explaining intermittent reception in a general mobile station.
  • the mobile communication system is an LTE mobile communication system.
  • an “OFDM (Orthogonal Frequency Division Multiplexing) method” is applied to the downlink
  • an “SC-FDMA (Single-Carrier Division Multiple Access) method” is applied to the uplink. Is being considered.
  • the OFDM scheme is a scheme in which a specific frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is transmitted on each frequency band. According to the OFDM scheme, high-speed transmission can be realized and frequency utilization efficiency can be improved by arranging subcarriers closely without interfering with each other while partially overlapping on the frequency axis.
  • the SC-FDMA scheme can reduce interference between a plurality of mobile stations UE by dividing a specific frequency band and transmitting using a different frequency band between the plurality of mobile stations UE. Transmission method. According to the SC-FDMA scheme, since the variation in transmission power is small, it is possible to realize low power consumption and wide coverage of the mobile station UE.
  • the radio base station eNB transmits a downlink control signal via the physical downlink control channel PDCCH and downlink data via the physical downlink shared data channel PDSCH (Physical Downlink Shared Channel). It is configured to transmit a signal.
  • PDCCH Physical Downlink control channel
  • PDSCH Physical Downlink Shared Channel
  • the mobile station UE is configured to transmit an uplink data signal via a physical uplink shared data channel PUSCH (Physical Uplink Shared Channel).
  • PUSCH Physical Uplink Shared Channel
  • the mobile station UE includes a state management unit 11, a parameter acquisition unit 12, a synchronization state determination unit 13, a radio link failure state determination unit 14, and a reconnection processing unit 15. Yes.
  • the state management unit 11 is configured to manage whether or not the mobile station UE is in an intermittent reception state.
  • the state management unit 11 determines whether or not the mobile station UE is in an intermittent reception state with respect to the synchronization state determination unit 13 and the radio link failure state determination unit 14, that is, in an intermittent reception state or a non-discontinuous reception state. Notify if it is.
  • the mobile station UE being in the non-discontinuous reception state may mean that the mobile station UE is in the Active state.
  • the Active state is defined in 3GPP TS36.321, V8.2.0, 5.7.
  • the state that is not in the Active state corresponds to the intermittent reception state.
  • the Active state may include an ON period in intermittent reception control, a time during which the DRX Inactivity Timer is activated, and a time during which the DRX Retransmission Timer and the Contention Resolution Timer are activated.
  • the Active state may include a time during which the scheduling request is pending.
  • the Active state indicates a new transmission having an RNTI addressed to itself or a provisional RNTI even when an uplink scheduling grant for retransmission occurs or after successful reception of a random access response.
  • the time when the PDCCH to be received is not received may be included.
  • DRX Retransmission Timer is a timer that is started after the expiration of the HARQ RTT Timer that is started after receiving newly transmitted packet data, and defines the time interval during which the packet data is retransmitted It is a timer to do.
  • the “Contention Resolution Timer” is a timer that is started from the timing at which Message 3 is transmitted in the random access procedure, and is a timer that defines a time interval in which Content Resolution by Message 4 is performed.
  • scheduling request is pending means a state from when a scheduling request is transmitted in the uplink until an uplink grant (uplink scheduling grant) is actually notified in the downlink Indicates.
  • the definition of the active state may be all of the above-described time or a part thereof.
  • the Active state may indicate only the time when the DRX Inactivity Timer is active.
  • the parameter acquisition unit 12 is configured to acquire the intermittent reception state parameter and the non-discontinuous reception state parameter from the radio base station eNB.
  • the parameter acquisition unit 12 notifies the radio link failure state determination unit 14 of the intermittent reception state parameter and the non-discontinuous reception state parameter.
  • the discontinuous reception state parameter and the non-discontinuous reception state parameter may be notified as part of broadcast information, or information of information in RRC Signaling individually notified to each mobile station UE in the cell. You may be notified as a part.
  • the synchronization state determination unit 13 is configured to measure the radio quality of the serving cell in the mobile station UE and determine the downlink synchronization state based on the radio quality.
  • the radio quality of the serving cell in the mobile station UE is the quality of the radio link between the radio base station eNB and the mobile station UE.
  • the synchronization state determination unit 13 measures the SIR of a signal from the serving cell of the mobile station UE (for example, a reference signal (RS: Reference Signal)) as the radio quality of the serving cell in the mobile station UE, and based on the SIR Thus, the downlink synchronization state may be determined.
  • a reference signal for example, a reference signal (RS: Reference Signal)
  • the synchronization state determination unit 13 determines that the downlink synchronization state is OK, that is, In-sync, and the SIR is a predetermined threshold. In the following cases, it may be determined that the downlink synchronization state is NG, that is, Out-of-sync.
  • the synchronization state determination unit 13 may set two threshold values of Qout and Qin, and determine the downlink synchronization state based on the above-described SIR, Qout, and Qin. .
  • Qout ⁇ Qin and the difference between Qin and Qout, that is, “Qin ⁇ Qout” corresponds to hysteresis.
  • the synchronization state determination unit 13 determines that the SIR is greater than Qout when T ⁇ A, and thus determines that it is In-sync. Based on this, it is determined that it is Out-of-sync.
  • the operation in the region between Qin and Qout, the operation may be performed so that neither In-sync nor Out-of-sync is reported.
  • the synchronous state determination part 13 may use the value which averaged instantaneous SIR in the predetermined average area as said SIR value.
  • the predetermined averaging period may be, for example, 160 ms, 200 ms, 20 ms, or other values.
  • the value of the SIR may be a value averaged over the entire system band in the frequency direction, or may be a value averaged over a part of the system band.
  • the partial band in the system band may be a band having a predetermined bandwidth located at the center of the system band, for example.
  • the partial band in the system band may be, for example, a band in which a synchronization signal or a physical broadcast channel is transmitted.
  • the synchronization state determination unit 13 determines the downlink synchronization state using the SIR averaged over the 160 ms averaging period, and the mobile station UE In the intermittent reception state, the downlink synchronization state may be determined using the SIR in the on-duration of the intermittent reception control.
  • the SIR in the on-duration of the intermittent reception control may be an instantaneous SIR in the on-duration, an average SIR in the on-duration, or the SIR in a plurality of on-durations. It may be an averaged value.
  • the synchronization state determination unit 13 notifies the radio link failure state determination unit 14 of the downlink synchronization state determination result (In-sync / Out-of-sync) described above.
  • the synchronization state determination unit 13 may notify the radio link failure state determination unit 14 of the downlink synchronization state determination result (In-sync / Out-of-sync) described above every 10 ms.
  • the above 10 ms is merely an example, and may be a value other than 10 ms.
  • the synchronization state determination unit 13 transmits the downlink synchronization state determination result (In-sync / Out-of-sync) described above for each radio link frame (Radio Link Frame). May be notified.
  • the synchronization state determination unit 13 notifies the determination result of the downlink synchronization state to the radio link failure state determination unit 14 every 10 ms, and the mobile station UE In the non-discontinuous reception state, the determination result of the downlink synchronization state may be notified to the radio link failure state determination unit 14 every DRX cycle.
  • notify the determination result of the downlink synchronization state for each DRX cycle means, for example, “notify the determination result of the downlink synchronization state at the timing of on-duration that exists for each DRX cycle”. May mean.
  • the synchronization state determination unit 13 acquires information about whether or not the mobile station UE is in an intermittent reception state from the state management unit 11.
  • the synchronization state determination unit 13 uses the SIR of the reference signal (Reference Signal) as the radio quality of the serving cell. Instead, the received power of the reference signal (Reference Signal Received Power (RSRP)). Alternatively, Reference Signal Received Quality (RSRQ) or CQI may be used.
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • CQI CQI
  • the synchronization state determination unit 13 uses a PDCCH error rate, a PCFICH error rate, a PCFICH SIR, a PDSCH error rate, a DL RS symbol error rate, etc., instead of the reference signal SIR. Also good.
  • the physical downlink control channel error rate may be calculated by assuming specific values regarding the transmission power per resource element, the PDCCH format, the aggregation level, and the like.
  • the aggregation level is a level for determining the number of resource elements and the number of symbols as PDCCH physical channels.
  • the number of resource elements and the number of symbols as physical channels of the PDCCH are determined.
  • the PDCCH format may be referred to as DCI format (Downlink Control Information format).
  • the synchronization state determination unit 13 may be configured such that the SIR of the reference signal (Reference Signal), the received power of the reference signal, the RSRQ, the CQI, the error rate of the PDCCH, the error rate of the PCFICH, At least one of the PCFICH SIR, the PDSCH error rate, and the DL RS symbol error rate may be used.
  • the SIR of the reference signal Reference Signal
  • the received power of the reference signal the RSRQ, the CQI
  • the error rate of the PDCCH the error rate of the PCFICH
  • At least one of the PCFICH SIR, the PDSCH error rate, and the DL RS symbol error rate may be used.
  • the RSRQ Reference Signal Received Quality Power
  • RSSI Received Signal Strength Indicator
  • RSSI is a total reception level observed in a mobile station, and includes a reception level including all of thermal noise, interference power from other cells, power of a desired signal from its own cell, and the like. Yes (see 3GPP TS 36.214, V8.3.0 for RSRQ definition).
  • CQI Channel Quality Indicator
  • CQI is downlink radio quality information (refer to 3GPP TS36.213, V8.3.0 for the definition of CQI).
  • the radio link failure state determination unit 14 is based on the determination result of the downlink synchronization state in the above-described synchronization state determination unit 13 and the intermittent reception state parameter and the non-discontinuous reception state parameter specified by the parameter acquisition unit 12. Thus, it is configured to determine whether or not the radio link is in a failed state.
  • the radio link failure state determination unit 14 activates a timer when the synchronization state determination unit 13 reports Out-of-sync N313 times consecutively, and when the timer expires, You may determine with a link failure state.
  • a notification indicating Out-of-sync is received as the link synchronization state.
  • the notification of In-sync is received N315 times continuously as the downlink synchronization state.
  • N313 and N315 are thresholds related to the number of times Out-of-sync or In-sync is continuously notified, but instead, Out-of-sync or In-sync is continuous. It may be a threshold regarding the time notified.
  • N313 and N315 described above may be the number of times that the synchronization state is notified from the synchronization state determination unit 13 as a unit, or instead, the time when the synchronization state is notified from the synchronization state determination unit 13 It may be.
  • N313”, “T313”, and “N315” are defined to determine whether or not the radio link is in a failed state. At least one of “N313”, “T313”, and “N315” may be used as a parameter for determining whether or not the radio link has failed.
  • N313 may be named N310.
  • T313 mentioned above may be named T310.
  • N315 described above may be named N311.
  • the radio link failer determination unit 14 determines that the radio link failure has occurred, the radio link failer determination unit 14 notifies the reconnection processing unit 15 of the determination result.
  • the intermittent reception state parameter and the non-discontinuous reception state parameter include “N313” which is the number of consecutive out-of-syncs for starting the above-described timer T313, and the above-described radio link failure state.
  • N313 which is a timer value for determining that there is a certain number
  • N315 which is the number of consecutive In-syncs for stopping the above-described timer, and the like are included.
  • FIG. 7 shows an example of the intermittent reception state parameters (“N313”, “T313”, and “N315”) and the non-discontinuous reception state parameters (“N313”, “T313”, and “N315”).
  • the mobile communication system according to the present embodiment is configured such that the value of the intermittent reception state parameter and the value of the non-discontinuous reception state parameter are different.
  • the value (N313) of the first parameter in the parameter for the intermittent reception state may be configured to be smaller than the value (N313) of the first parameter in the parameter for the non-discontinuous reception state.
  • the determination frequency for determining the downlink synchronization state is less than in the non-discontinuous reception state, and as a result, the interval between each determination is increased.
  • the appropriate length is, for example, a reflection time necessary for determining that the wireless failure state has occurred, and is preferably as short as possible if it can be accurately determined.
  • the value (N313) of the first parameter in the parameter for the intermittent reception state may be configured to be larger than the value (N313) of the first parameter in the parameter for the non-discontinuous reception state.
  • the value (N313) of the first parameter in the parameter for the intermittent reception state may be 10
  • the value (N313) of the first parameter in the parameter for the non-discontinuous reception state may be 2.
  • the number of samples is, for example, the number of samples necessary for accurately determining that the wireless failure state has occurred.
  • the wireless failure state can be appropriately set in the intermittent reception state. It can be determined that
  • the wireless failure state can be appropriately set in the intermittent reception state. It is possible to determine whether or not.
  • the radio link failure state determination unit 14 determines the downlink synchronization state determined by the synchronization state determination unit 13 and the intermittent acquisition acquired by the parameter acquisition unit 12. Based on the reception status parameter, it is configured to determine whether or not the radio link is in a failed state.
  • the radio link failure state determination unit 14 determines the downlink synchronization state determined by the synchronization state determination unit 13 and the non-intermittent acquired by the parameter acquisition unit 12. Based on the reception status parameter, it is configured to determine whether or not the radio link is in a failed state.
  • the reconnection processing unit 15 performs reconnection processing when the wireless link failure state determination unit 14 is notified of the determination result that the wireless link failure state is present. Further, the reconnection processing unit 15 may clear a communication configuration (Configuration) between the mobile station UE and the radio base station eNB before performing the reconnection process.
  • Cell Update process means, for example, cell search, measurement of the wireless quality of the searched cell, etc., and when there is a communicable cell, connection establishment is performed again for the cell. Point to.
  • Cell Update process may be referred to as a “Connection Re-establishment process”.
  • the mobile station performs the reconnection process described above when there is no ongoing process, or when the operation during the radio link failure state is not specified in the ongoing process. Also good. In this case, if there is a process in progress and the operation in the process of radio link failure is specified in the process in progress, the radio link failed in the process in progress May be performed.
  • the radio base station eNB includes a parameter notification unit 21 and a reconnection processing unit 22.
  • the parameter notification unit 21 is configured to notify the mobile station UE of the above-described intermittent reception state parameter and non-discontinuous reception state parameter.
  • the parameter notification unit 21 is configured to notify the mobile station UE of the above-described intermittent reception state parameter and non-discontinuous reception state parameter to the mobile station UE via the physical downlink shared channel PDSCH. .
  • the intermittent reception state parameter and the non-discontinuous reception state parameter described above may be notified to the mobile station UE as a part of broadcast information, or a part of information in an individual control signal or RRC Message. May be notified to the mobile station UE.
  • the reconnection processing unit 22 performs the reconnection process when the mobile station UE performs the reconnection process described above and notifies the signaling for reconnection. That is, processing for reestablishing a connection (connection) with the mobile station UE is performed.
  • step S201 the mobile station UE determines whether or not it is in an intermittent reception state (DRX state). If it is not the intermittent reception state (DRX state), this operation proceeds to step S202. If it is the intermittent reception state (DRX state), this operation proceeds to step S207.
  • DRX state the intermittent reception state
  • step S202 the mobile station UE reports N313 Non DRX (first parameter in the non-discontinuous reception state parameter) times “Out-of-sync”, that is, “synchronization state: NG” continuously from the physical layer. Is received (S202: YES), the timer T313 Non DRX is started (S203). Note that steps S202 and S204 may be performed only when the timer T313 Non DRX (second parameter in the non-discontinuous reception state parameter) is not activated.
  • step S204 the mobile station UE reports N315 Non DRX (third parameter in the non-discontinuous reception state parameter) times “In-sync”, that is, “synchronization state: OK” continuously from the physical layer. Is received (S204: YES), the timer T313 Non DRX is stopped (S205). Note that steps S204 and S205 may be performed only when the timer T313 Non DRX is activated.
  • step S206 If T313 Non DRX has expired (step S206: YES), the operation proceeds to step S212. When T313 Non DRX does not expire (step S206: NO), the operation returns to step S201. Note that step S206 may be performed in both the case where the case and the T313 Non DRX T313 Non DRX is activated is not activated.
  • step S207 the mobile station UE reports N313 DRX (first parameter in discontinuous reception state parameter) times “Out-of-sync”, that is, “synchronization state: NG” continuously from the physical layer. Is received (S207: YES), the timer T313 DRX is started (S208). Note that steps S207 and S208 may be performed only when the timer T313 DRX (second parameter in the intermittent reception state parameter) is not started.
  • step S209 the mobile station UE receives N315 DRX (third parameter in discontinuous reception state parameter) times “In-sync”, that is, “synchronization state: OK” reports continuously from the physical layer. If so (S209: YES), the timer T313 DRX is stopped (S210). Note that steps S209 and S210 may be performed only when the timer T313 DRX is activated.
  • step S211 If T313 DRX has expired (step S211: YES), the operation proceeds to step S212. In addition, when T313 DRX does not expire (step S211: NO), this operation returns to step S201. Note that step S211 may be performed in both the case where the case and the T313 DRX T313 DRX is started is not started.
  • step S212 the mobile station UE considers that the communication state between the radio base station eNB and the mobile station UE is a radio link failure state.
  • step S213 the mobile station UE clears the configuration (configuration) of communication with the radio base station eNB.
  • step S214 the mobile station UE performs reconnection processing.
  • the values of the intermittent reception state parameter and the non-discontinuous reception state parameter can be changed according to whether or not the DRX state is present. It is possible to determine that the mobile station UE is in a radio link failure state at an appropriate timing and with an appropriate accuracy, stable communication quality, rapid reconfiguration of communication, and user convenience. Can be improved.
  • the second parameter “T313” in the intermittent reception state parameter may be the same as the second parameter “T313” in the non-intermittent reception state parameter, or the second parameter “T313” in the intermittent reception state parameter may be The second parameter “T313” in the non-discontinuous reception state parameter may be different.
  • N315 is defined not by the number of times but by time.
  • first and second parameters “T313” and “N315” in the discontinuous reception state parameter may be the same as the first and second parameters “T313” and “N315” in the non-discontinuous reception state parameter.
  • the first and second parameters “T313” and “N315” in the intermittent reception state parameter may be different from the first and second parameters “T313” and “N315” in the non-discontinuous reception state parameter.
  • N313 since there is no “N313”, it has a simpler structure and is controlled by time, so that it is determined to be a radio link failure state between the intermittent reception state and the non-intermittent reception state. Appropriate control is possible if the time is considered the same.
  • N315 is defined not by the number of times but by time. In this third modification, “N315” may be defined by the number of times instead.
  • an intermittent reception state there are two types of states, an intermittent reception state and a non-discontinuous reception state. Instead, a long intermittent reception state, a short intermittent reception state, and a non-intermittent reception state are provided. Even when three types of states exist, the mobile station, the radio base station, and the mobile communication method according to the present invention can be applied.
  • the long intermittent reception state parameter and the short intermittent state are used as the first parameter and the second parameter described above.
  • Three types of parameters, a reception state parameter and a non-discontinuous reception state parameter, may be defined, and each parameter may be applied in each state.
  • a long intermittent reception state when there are three types of states, a long intermittent reception state, a short intermittent reception state, and a non-discontinuous reception state, two types of parameters, an intermittent reception state parameter and a non-discontinuous reception state parameter, are defined and long intermittent reception is performed.
  • the intermittent reception state parameter In the state and the short discontinuous reception state, the intermittent reception state parameter may be applied, and in the non-discontinuous reception state, the non-discontinuous reception parameter may be applied.
  • a long intermittent reception state when there are three types of states, a long intermittent reception state, a short intermittent reception state, and a non-discontinuous reception state, two types of parameters, a long intermittent reception state parameter and a non-long intermittent reception state parameter, are defined and long
  • the long intermittent reception state parameter may be applied, and in the short intermittent reception state and the non-discontinuous reception state, the non-long intermittent reception parameter may be applied.
  • radio base station eNB and the mobile station UE described above may be implemented by hardware, may be implemented by a software module executed by a processor, or may be implemented by a combination of both. .
  • Software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, and Hard Disk). Alternatively, it may be provided in an arbitrary format storage medium such as a CD-ROM.
  • the storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Further, such a storage medium and a processor may be provided in the ASIC. Such an ASIC may be provided in the radio base station eNB or the mobile station UE. Further, the storage medium and the processor may be provided as a discrete component in the radio base station eNB or the mobile station UE.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un équipement utilisateur (UE) de station mobile dans lequel, en cas d'état de réception intermittente, l'unité de détermination de l'état d'échec de la liaison radio (14) est conçue de façon à déterminer l'état d'échec ou non de la liaison radio en fonction des paramètres d'état de synchronisation et des paramètres d'état de réception intermittente de la liaison descendante; lorsqu'il ne s'agit pas d'un état de réception intermittente, l'unité de détermination de l'état d'échec de la liaison radio (14) est conçue de façon à déterminer l'état d'échec ou non de la liaison radio sur la base des paramètres d'état de synchronisation et des paramètres d'état de réception non-intermittente de la liaison descendante.
PCT/JP2009/066225 2008-09-22 2009-09-17 Station mobile, station de base radio et procédé de communication mobile Ceased WO2010032775A1 (fr)

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JP2010529785A JP5406841B2 (ja) 2008-09-22 2009-09-17 移動局、無線基地局及び移動通信方法
US13/120,352 US8797882B2 (en) 2008-09-22 2009-09-17 Mobile station, radio base station, and mobile communication method for determining a radio link failure in both a discontinuous state and a non-discontinuous state
EP09814619.4A EP2341741A4 (fr) 2008-09-22 2009-09-17 Station mobile, station de base radio et procédé de communication mobile
CN200980137007.5A CN102160434B (zh) 2008-09-22 2009-09-17 移动台、无线基站以及移动通信方法

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US8797882B2 (en) 2014-08-05
CN102160434A (zh) 2011-08-17
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EP2341741A1 (fr) 2011-07-06
US20110211458A1 (en) 2011-09-01
EP2341741A4 (fr) 2016-05-25
KR20110067105A (ko) 2011-06-21
CN102160434B (zh) 2015-04-29

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